drivers/virt/acrn/mm.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * ACRN: Memory mapping management
  *
  * Copyright (C) 2020 Intel Corporation. All rights reserved.
  *
  * Authors:
  *	Fei Li <lei1.li@intel.com>
  *	Shuo Liu <shuo.a.liu@intel.com>
  */

 #include <linux/io.h>
 #include <linux/mm.h>
 #include <linux/slab.h>

 #include "acrn_drv.h"

 static int modify_region(struct acrn_vm *vm, struct vm_memory_region_op *region)
 {
 	struct vm_memory_region_batch *regions;
 	int ret;

 	regions = kzalloc(sizeof(*regions), GFP_KERNEL);
 	if (!regions)
 		return -ENOMEM;

 	regions->vmid = vm->vmid;
 	regions->regions_num = 1;
 	regions->regions_gpa = virt_to_phys(region);

 	ret = hcall_set_memory_regions(virt_to_phys(regions));
 	if (ret < 0)
 		dev_dbg(acrn_dev.this_device,
 			"Failed to set memory region for VM[%u]!\n", vm->vmid);

 	kfree(regions);
 	return ret;
 }

 /**
  * acrn_mm_region_add() - Set up the EPT mapping of a memory region.
  * @vm:			User VM.
  * @user_gpa:		A GPA of User VM.
  * @service_gpa:	A GPA of Service VM.
  * @size:		Size of the region.
  * @mem_type:		Combination of ACRN_MEM_TYPE_*.
  * @mem_access_right:	Combination of ACRN_MEM_ACCESS_*.
  *
  * Return: 0 on success, <0 on error.
  */
 int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
 		       u64 size, u32 mem_type, u32 mem_access_right)
 {
 	struct vm_memory_region_op *region;
 	int ret = 0;

 	region = kzalloc(sizeof(*region), GFP_KERNEL);
 	if (!region)
 		return -ENOMEM;

 	region->type = ACRN_MEM_REGION_ADD;
 	region->user_vm_pa = user_gpa;
 	region->service_vm_pa = service_gpa;
 	region->size = size;
 	region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) |
 			(mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
 	ret = modify_region(vm, region);

 	dev_dbg(acrn_dev.this_device,
 		"%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
 		__func__, (void *)user_gpa, (void *)service_gpa, size);
 	kfree(region);
 	return ret;
 }

 /**
  * acrn_mm_region_del() - Del the EPT mapping of a memory region.
  * @vm:		User VM.
  * @user_gpa:	A GPA of the User VM.
  * @size:	Size of the region.
  *
  * Return: 0 on success, <0 for error.
  */
 int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
 {
 	struct vm_memory_region_op *region;
 	int ret = 0;

 	region = kzalloc(sizeof(*region), GFP_KERNEL);
 	if (!region)
 		return -ENOMEM;

 	region->type = ACRN_MEM_REGION_DEL;
 	region->user_vm_pa = user_gpa;
 	region->service_vm_pa = 0UL;
 	region->size = size;
 	region->attr = 0U;

 	ret = modify_region(vm, region);

 	dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
 		__func__, (void *)user_gpa, size);
 	kfree(region);
 	return ret;
 }

 int acrn_vm_memseg_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 {
 	int ret;

 	if (memmap->type == ACRN_MEMMAP_RAM)
 		return acrn_vm_ram_map(vm, memmap);

 	if (memmap->type != ACRN_MEMMAP_MMIO) {
 		dev_dbg(acrn_dev.this_device,
 			"Invalid memmap type: %u\n", memmap->type);
 		return -EINVAL;
 	}

 	ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
 				 memmap->service_vm_pa, memmap->len,
 				 ACRN_MEM_TYPE_UC, memmap->attr);
 	if (ret < 0)
 		dev_dbg(acrn_dev.this_device,
 			"Add memory region failed, VM[%u]!\n", vm->vmid);

 	return ret;
 }

 int acrn_vm_memseg_unmap(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 {
 	int ret;

 	if (memmap->type != ACRN_MEMMAP_MMIO) {
 		dev_dbg(acrn_dev.this_device,
 			"Invalid memmap type: %u\n", memmap->type);
 		return -EINVAL;
 	}

 	ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
 	if (ret < 0)
 		dev_dbg(acrn_dev.this_device,
 			"Del memory region failed, VM[%u]!\n", vm->vmid);

 	return ret;
 }

 /**
  * acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
  * @vm:		The User VM pointer
  * @memmap:	Info of the EPT mapping
  *
  * Return: 0 on success, <0 for error.
  */
 int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 {
 	struct vm_memory_region_batch *regions_info;
 	int nr_pages, i = 0, order, nr_regions = 0;
 	struct vm_memory_mapping *region_mapping;
 	struct vm_memory_region_op *vm_region;
 	struct page **pages = NULL, *page;
 	void *remap_vaddr;
 	int ret, pinned;
 	u64 user_vm_pa;
 	unsigned long pfn;
 	struct vm_area_struct *vma;

 	if (!vm || !memmap)
 		return -EINVAL;

 	mmap_read_lock(current->mm);
 	vma = vma_lookup(current->mm, memmap->vma_base);
 	if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
 		if ((memmap->vma_base + memmap->len) > vma->vm_end) {
 			mmap_read_unlock(current->mm);
 			return -EINVAL;
 		}

 		ret = follow_pfn(vma, memmap->vma_base, &pfn);
 		mmap_read_unlock(current->mm);
 		if (ret < 0) {
 			dev_dbg(acrn_dev.this_device,
 				"Failed to lookup PFN at VMA:%pK.\n", (void *)memmap->vma_base);
 			return ret;
 		}

 		return acrn_mm_region_add(vm, memmap->user_vm_pa,
 			 PFN_PHYS(pfn), memmap->len,
 			 ACRN_MEM_TYPE_WB, memmap->attr);
 	}
 	mmap_read_unlock(current->mm);

 	/* Get the page number of the map region */
 	nr_pages = memmap->len >> PAGE_SHIFT;
 	pages = vzalloc(array_size(nr_pages, sizeof(*pages)));
 	if (!pages)
 		return -ENOMEM;

 	/* Lock the pages of user memory map region */
 	pinned = pin_user_pages_fast(memmap->vma_base,
 				     nr_pages, FOLL_WRITE | FOLL_LONGTERM,
 				     pages);
 	if (pinned < 0) {
 		ret = pinned;
 		goto free_pages;
 	} else if (pinned != nr_pages) {
 		ret = -EFAULT;
 		goto put_pages;
 	}

 	/* Create a kernel map for the map region */
 	remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
 	if (!remap_vaddr) {
 		ret = -ENOMEM;
 		goto put_pages;
 	}

 	/* Record Service VM va <-> User VM pa mapping */
 	mutex_lock(&vm->regions_mapping_lock);
 	region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
 	if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
 		region_mapping->pages = pages;
 		region_mapping->npages = nr_pages;
 		region_mapping->size = memmap->len;
 		region_mapping->service_vm_va = remap_vaddr;
 		region_mapping->user_vm_pa = memmap->user_vm_pa;
 		vm->regions_mapping_count++;
 	} else {
 		dev_warn(acrn_dev.this_device,
 			"Run out of memory mapping slots!\n");
 		ret = -ENOMEM;
 		mutex_unlock(&vm->regions_mapping_lock);
 		goto unmap_no_count;
 	}
 	mutex_unlock(&vm->regions_mapping_lock);

 	/* Calculate count of vm_memory_region_op */
 	while (i < nr_pages) {
 		page = pages[i];
 		VM_BUG_ON_PAGE(PageTail(page), page);
 		order = compound_order(page);
 		nr_regions++;
 		i += 1 << order;
 	}

 	/* Prepare the vm_memory_region_batch */
 	regions_info = kzalloc(struct_size(regions_info, regions_op,
 					   nr_regions), GFP_KERNEL);
 	if (!regions_info) {
 		ret = -ENOMEM;
 		goto unmap_kernel_map;
 	}

 	/* Fill each vm_memory_region_op */
 	vm_region = regions_info->regions_op;
 	regions_info->vmid = vm->vmid;
 	regions_info->regions_num = nr_regions;
 	regions_info->regions_gpa = virt_to_phys(vm_region);
 	user_vm_pa = memmap->user_vm_pa;
 	i = 0;
 	while (i < nr_pages) {
 		u32 region_size;

 		page = pages[i];
 		VM_BUG_ON_PAGE(PageTail(page), page);
 		order = compound_order(page);
 		region_size = PAGE_SIZE << order;
 		vm_region->type = ACRN_MEM_REGION_ADD;
 		vm_region->user_vm_pa = user_vm_pa;
 		vm_region->service_vm_pa = page_to_phys(page);
 		vm_region->size = region_size;
 		vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) |
 				  (memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);

 		vm_region++;
 		user_vm_pa += region_size;
 		i += 1 << order;
 	}

 	/* Inform the ACRN Hypervisor to set up EPT mappings */
 	ret = hcall_set_memory_regions(virt_to_phys(regions_info));
 	if (ret < 0) {
 		dev_dbg(acrn_dev.this_device,
 			"Failed to set regions, VM[%u]!\n", vm->vmid);
 		goto unset_region;
 	}
 	kfree(regions_info);

 	dev_dbg(acrn_dev.this_device,
 		"%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
 		__func__, vm->vmid,
 		remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
 	return ret;

 unset_region:
 	kfree(regions_info);
 unmap_kernel_map:
 	mutex_lock(&vm->regions_mapping_lock);
 	vm->regions_mapping_count--;
 	mutex_unlock(&vm->regions_mapping_lock);
 unmap_no_count:
 	vunmap(remap_vaddr);
 put_pages:
 	for (i = 0; i < pinned; i++)
 		unpin_user_page(pages[i]);
 free_pages:
 	vfree(pages);
 	return ret;
 }

 /**
  * acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
  * @vm:	The User VM
  */
 void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
 {
 	struct vm_memory_mapping *region_mapping;
 	int i, j;

 	mutex_lock(&vm->regions_mapping_lock);
 	for (i = 0; i < vm->regions_mapping_count; i++) {
 		region_mapping = &vm->regions_mapping[i];
 		vunmap(region_mapping->service_vm_va);
 		for (j = 0; j < region_mapping->npages; j++)
 			unpin_user_page(region_mapping->pages[j]);
 		vfree(region_mapping->pages);
 	}
 	mutex_unlock(&vm->regions_mapping_lock);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* ACRN: Memory mapping management
	*
	* Copyright (C) 2020 Intel Corporation. All rights reserved.
	*
	* Authors:
	* Fei Li <lei1.li@intel.com>
	* Shuo Liu <shuo.a.liu@intel.com>
	*/

	#include <linux/io.h>
	#include <linux/mm.h>
	#include <linux/slab.h>

	#include "acrn_drv.h"

	static int modify_region(struct acrn_vm vm, struct vm_memory_region_op region)
	{
	struct vm_memory_region_batch *regions;
	int ret;

	regions = kzalloc(sizeof(*regions), GFP_KERNEL);
	if (!regions)
	return -ENOMEM;

	regions->vmid = vm->vmid;
	regions->regions_num = 1;
	regions->regions_gpa = virt_to_phys(region);

	ret = hcall_set_memory_regions(virt_to_phys(regions));
	if (ret < 0)
	dev_dbg(acrn_dev.this_device,
	"Failed to set memory region for VM[%u]!\n", vm->vmid);

	kfree(regions);
	return ret;
	}

	/**
	* acrn_mm_region_add() - Set up the EPT mapping of a memory region.
	* @vm: User VM.
	* @user_gpa: A GPA of User VM.
	* @service_gpa: A GPA of Service VM.
	* @size: Size of the region.
	* @mem_type: Combination of ACRN_MEM_TYPE_*.
	* @mem_access_right: Combination of ACRN_MEM_ACCESS_*.
	*
	* Return: 0 on success, <0 on error.
	*/
	int acrn_mm_region_add(struct acrn_vm *vm, u64 user_gpa, u64 service_gpa,
	u64 size, u32 mem_type, u32 mem_access_right)
	{
	struct vm_memory_region_op *region;
	int ret = 0;

	region = kzalloc(sizeof(*region), GFP_KERNEL);
	if (!region)
	return -ENOMEM;

	region->type = ACRN_MEM_REGION_ADD;
	region->user_vm_pa = user_gpa;
	region->service_vm_pa = service_gpa;
	region->size = size;
	region->attr = ((mem_type & ACRN_MEM_TYPE_MASK) \|
	(mem_access_right & ACRN_MEM_ACCESS_RIGHT_MASK));
	ret = modify_region(vm, region);

	dev_dbg(acrn_dev.this_device,
	"%s: user-GPA[%pK] service-GPA[%pK] size[0x%llx].\n",
	__func__, (void )user_gpa, (void )service_gpa, size);
	kfree(region);
	return ret;
	}

	/**
	* acrn_mm_region_del() - Del the EPT mapping of a memory region.
	* @vm: User VM.
	* @user_gpa: A GPA of the User VM.
	* @size: Size of the region.
	*
	* Return: 0 on success, <0 for error.
	*/
	int acrn_mm_region_del(struct acrn_vm *vm, u64 user_gpa, u64 size)
	{
	struct vm_memory_region_op *region;
	int ret = 0;

	region = kzalloc(sizeof(*region), GFP_KERNEL);
	if (!region)
	return -ENOMEM;

	region->type = ACRN_MEM_REGION_DEL;
	region->user_vm_pa = user_gpa;
	region->service_vm_pa = 0UL;
	region->size = size;
	region->attr = 0U;

	ret = modify_region(vm, region);

	dev_dbg(acrn_dev.this_device, "%s: user-GPA[%pK] size[0x%llx].\n",
	__func__, (void *)user_gpa, size);
	kfree(region);
	return ret;
	}

	int acrn_vm_memseg_map(struct acrn_vm vm, struct acrn_vm_memmap memmap)
	{
	int ret;

	if (memmap->type == ACRN_MEMMAP_RAM)
	return acrn_vm_ram_map(vm, memmap);

	if (memmap->type != ACRN_MEMMAP_MMIO) {
	dev_dbg(acrn_dev.this_device,
	"Invalid memmap type: %u\n", memmap->type);
	return -EINVAL;
	}

	ret = acrn_mm_region_add(vm, memmap->user_vm_pa,
	memmap->service_vm_pa, memmap->len,
	ACRN_MEM_TYPE_UC, memmap->attr);
	if (ret < 0)
	dev_dbg(acrn_dev.this_device,
	"Add memory region failed, VM[%u]!\n", vm->vmid);

	return ret;
	}

	int acrn_vm_memseg_unmap(struct acrn_vm vm, struct acrn_vm_memmap memmap)
	{
	int ret;

	if (memmap->type != ACRN_MEMMAP_MMIO) {
	dev_dbg(acrn_dev.this_device,
	"Invalid memmap type: %u\n", memmap->type);
	return -EINVAL;
	}

	ret = acrn_mm_region_del(vm, memmap->user_vm_pa, memmap->len);
	if (ret < 0)
	dev_dbg(acrn_dev.this_device,
	"Del memory region failed, VM[%u]!\n", vm->vmid);

	return ret;
	}

	/**
	* acrn_vm_ram_map() - Create a RAM EPT mapping of User VM.
	* @vm: The User VM pointer
	* @memmap: Info of the EPT mapping
	*
	* Return: 0 on success, <0 for error.
	*/
	int acrn_vm_ram_map(struct acrn_vm vm, struct acrn_vm_memmap memmap)
	{
	struct vm_memory_region_batch *regions_info;
	int nr_pages, i = 0, order, nr_regions = 0;
	struct vm_memory_mapping *region_mapping;
	struct vm_memory_region_op *vm_region;
	struct page *pages = NULL, page;
	void *remap_vaddr;
	int ret, pinned;
	u64 user_vm_pa;
	unsigned long pfn;
	struct vm_area_struct *vma;

	if (!vm \|\| !memmap)
	return -EINVAL;

	mmap_read_lock(current->mm);
	vma = vma_lookup(current->mm, memmap->vma_base);
	if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
	if ((memmap->vma_base + memmap->len) > vma->vm_end) {
	mmap_read_unlock(current->mm);
	return -EINVAL;
	}

	ret = follow_pfn(vma, memmap->vma_base, &pfn);
	mmap_read_unlock(current->mm);
	if (ret < 0) {
	dev_dbg(acrn_dev.this_device,
	"Failed to lookup PFN at VMA:%pK.\n", (void *)memmap->vma_base);
	return ret;
	}

	return acrn_mm_region_add(vm, memmap->user_vm_pa,
	PFN_PHYS(pfn), memmap->len,
	ACRN_MEM_TYPE_WB, memmap->attr);
	}
	mmap_read_unlock(current->mm);

	/* Get the page number of the map region */
	nr_pages = memmap->len >> PAGE_SHIFT;
	pages = vzalloc(array_size(nr_pages, sizeof(*pages)));
	if (!pages)
	return -ENOMEM;

	/* Lock the pages of user memory map region */
	pinned = pin_user_pages_fast(memmap->vma_base,
	nr_pages, FOLL_WRITE \| FOLL_LONGTERM,
	pages);
	if (pinned < 0) {
	ret = pinned;
	goto free_pages;
	} else if (pinned != nr_pages) {
	ret = -EFAULT;
	goto put_pages;
	}

	/* Create a kernel map for the map region */
	remap_vaddr = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
	if (!remap_vaddr) {
	ret = -ENOMEM;
	goto put_pages;
	}

	/* Record Service VM va <-> User VM pa mapping */
	mutex_lock(&vm->regions_mapping_lock);
	region_mapping = &vm->regions_mapping[vm->regions_mapping_count];
	if (vm->regions_mapping_count < ACRN_MEM_MAPPING_MAX) {
	region_mapping->pages = pages;
	region_mapping->npages = nr_pages;
	region_mapping->size = memmap->len;
	region_mapping->service_vm_va = remap_vaddr;
	region_mapping->user_vm_pa = memmap->user_vm_pa;
	vm->regions_mapping_count++;
	} else {
	dev_warn(acrn_dev.this_device,
	"Run out of memory mapping slots!\n");
	ret = -ENOMEM;
	mutex_unlock(&vm->regions_mapping_lock);
	goto unmap_no_count;
	}
	mutex_unlock(&vm->regions_mapping_lock);

	/* Calculate count of vm_memory_region_op */
	while (i < nr_pages) {
	page = pages[i];
	VM_BUG_ON_PAGE(PageTail(page), page);
	order = compound_order(page);
	nr_regions++;
	i += 1 << order;
	}

	/* Prepare the vm_memory_region_batch */
	regions_info = kzalloc(struct_size(regions_info, regions_op,
	nr_regions), GFP_KERNEL);
	if (!regions_info) {
	ret = -ENOMEM;
	goto unmap_kernel_map;
	}

	/* Fill each vm_memory_region_op */
	vm_region = regions_info->regions_op;
	regions_info->vmid = vm->vmid;
	regions_info->regions_num = nr_regions;
	regions_info->regions_gpa = virt_to_phys(vm_region);
	user_vm_pa = memmap->user_vm_pa;
	i = 0;
	while (i < nr_pages) {
	u32 region_size;

	page = pages[i];
	VM_BUG_ON_PAGE(PageTail(page), page);
	order = compound_order(page);
	region_size = PAGE_SIZE << order;
	vm_region->type = ACRN_MEM_REGION_ADD;
	vm_region->user_vm_pa = user_vm_pa;
	vm_region->service_vm_pa = page_to_phys(page);
	vm_region->size = region_size;
	vm_region->attr = (ACRN_MEM_TYPE_WB & ACRN_MEM_TYPE_MASK) \|
	(memmap->attr & ACRN_MEM_ACCESS_RIGHT_MASK);

	vm_region++;
	user_vm_pa += region_size;
	i += 1 << order;
	}

	/* Inform the ACRN Hypervisor to set up EPT mappings */
	ret = hcall_set_memory_regions(virt_to_phys(regions_info));
	if (ret < 0) {
	dev_dbg(acrn_dev.this_device,
	"Failed to set regions, VM[%u]!\n", vm->vmid);
	goto unset_region;
	}
	kfree(regions_info);

	dev_dbg(acrn_dev.this_device,
	"%s: VM[%u] service-GVA[%pK] user-GPA[%pK] size[0x%llx]\n",
	__func__, vm->vmid,
	remap_vaddr, (void *)memmap->user_vm_pa, memmap->len);
	return ret;

	unset_region:
	kfree(regions_info);
	unmap_kernel_map:
	mutex_lock(&vm->regions_mapping_lock);
	vm->regions_mapping_count--;
	mutex_unlock(&vm->regions_mapping_lock);
	unmap_no_count:
	vunmap(remap_vaddr);
	put_pages:
	for (i = 0; i < pinned; i++)
	unpin_user_page(pages[i]);
	free_pages:
	vfree(pages);
	return ret;
	}

	/**
	* acrn_vm_all_ram_unmap() - Destroy a RAM EPT mapping of User VM.
	* @vm: The User VM
	*/
	void acrn_vm_all_ram_unmap(struct acrn_vm *vm)
	{
	struct vm_memory_mapping *region_mapping;
	int i, j;

	mutex_lock(&vm->regions_mapping_lock);
	for (i = 0; i < vm->regions_mapping_count; i++) {
	region_mapping = &vm->regions_mapping[i];
	vunmap(region_mapping->service_vm_va);
	for (j = 0; j < region_mapping->npages; j++)
	unpin_user_page(region_mapping->pages[j]);
	vfree(region_mapping->pages);
	}
	mutex_unlock(&vm->regions_mapping_lock);
	}